User`s guide

Configuring OSPF Routing
Configuring OSPF routing in the MultiVoice Gateway
MultiVoice Gateway for the MAX— User’s Guide Preliminary November 23, 1998 9-11
Priority Value used by the routers in the network to elect a Designated
Router (DR) and Backup Designated Router (BDR). Assigning a
priority of 1 would place the MultiVoice Gateway near the top of
the list of possible designated routers. (Currently, you should
assign a larger number.) Acting as a DR or BDR significantly
increases the amount of OSPF overhead for the router. (For a
discussion of the functions of DRs and BDRs, see “Designated
and backup designated routers” on page 9-4.)
Auth Type Type of authentication supported. The Normal setting specifies
that the MultiVoice Gateway supports OSPF router
authentication. (For more information, see “Security” on
page 9-3.)
Auth Key Specifies the key that the MultiVoice Gateway looks for in
packets to support OSPF router authentication.
Cost Specifies the link-state or output cost of a route. Assign realistic
costs for each interface that supports OSPF. The lower the cost,
the higher the likelihood of using that route to forward traffic.
(For more information, see “Configurable metrics” on page 9-5.)
ASE-type and ASE-tag Autonomous System External (ASE) routes are used only when
OSPF is turned off on a particular interface. When OSPF is
enabled, the ASE parameters are not applicable.
ASE-type specifies the type of metric that the MultiVoice
Gateway advertises for external routes. A Type-1 external metric
is expressed in the same units as the link-state metric (the same
units as interface cost). A Type-2 external metric is considered
larger than any link state path. Use of Type-2 external metrics
assumes that routing between autonomous systems is the major
cost of routing a packet, and eliminates the need for conversion
of external costs to internal link-state metrics.
TransitDelay Specifies the estimated number of seconds it takes to transmit a
Link State Update Packet over this interface, taking into account
transmission and propagation delays. On a connected route, you
can leave the default of 1.
RetransmitInterval Specify the number of seconds between retransmissions of
Link-State Advertisements, Database Description, and Link
State Request Packets.
OSPF global options Enable or disable Autonomous System Border Routers (ASBRs)
calculations related to external routes. The MultiVoice Gateway
imports external routes from RIP (for example, when it
establishes a WAN link with a caller that does not support OSPF)
and performs the ASBR calculations. If you must prevent the
MultiVoice Gateway from performing ASBR calculations, you
can disable them in Ethernet > Mod Config > OSPF Global
Options.
Parameters Description